Table 1.

Comparison between the study sample and France (ESPAD survey [2,51] (%)

	Study population	France
	(limited to <16 years a))	<16 years
	(N = 1,524)	(N = 8,367)
Boys	49.9	48.9
Family structure
Intact	63.2	74.7
Reconstructed	15.0	11.3
Single parent	16.4	11.7
Others	5.4	2.3
Last-30-day substance use
Tobacco	10.7	13.6
Alcohol	34.7	34.6
Cannabis	5.1	5.5
Sleep disorders	32.6	29.0
Asthma	17.2	16.3
Depressive symptoms	13.1	9.8
Last-12-month suicidal ideation	11.6	9.1
Lifetime suicide attempts	9.6	7.2
Sexual abuse	3.4	1.9
Sustained physical/verbal violence (at least once)	53.3	51.5

^a) were excluded 35 subjects aged 16 years or over.